HD 2685 b: a hot Jupiter orbiting an early F-type star detected by TESS^★

¹ European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile
e-mail: mjones@eso.org
² Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile
³ Millennium Institute of Astrophysics, 7820436 Santiago, Chile
⁴ Max-Planck-Institut fur Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
⁵ Department of Astronomy, Yale University, New Haven, CT 06511, USA
⁶ Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
⁷ Physics and Astronomy Department, Georgia State University, Atlanta, GA 30302, USA
⁸ RECONS Institute, Chambersburg, PA, USA
⁹ Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290 Versoix, Switzerland
¹⁰ Department of Astrophysical Sciences, Princeton University, NJ 08544, USA
¹¹ Las Campanas Observatory, Carnegie Institution of Washington, Colina el Pino, Casilla 601 La Serena, Chile
¹² Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Ontario M5S 3H4, Canada
¹³ Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
¹⁴ Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA
¹⁵ Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
¹⁶ Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
¹⁷ Department of Earth and Planetary Sciences, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
¹⁸ Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA
¹⁹ NASA Ames Research Center, Moffett Field, CA 94035, USA
²⁰ SETI Institute, 189 Bernardo Avenue, Suite 100, Mountain View, CA 94043, USA
²¹ Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA
²² Caltech/IPAC-NASA Exoplanet Science Institute Pasadena, CA, USA
²³ Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA
²⁴ Exoplanets and Stellar Astrophysics Laboratory, Code 667, NASA Goddard Space Flight Center, Greenbelt, MD, USA

Received: 13 November 2018
Accepted: 11 February 2019

Abstract

We report on the confirmation of a transiting giant planet around the relatively hot (T_eff = 6801 ± 76 K) star HD 2685, whose transit signal was detected in Sector 1 data of NASA’s TESS mission. We confirmed the planetary nature of the transit signal using Doppler velocimetric measurements with CHIRON, CORALIE, and FEROS, as well as using photometric data obtained with the Chilean-Hungarian Automated Telescope and the Las Cumbres Observatory. From the joint analysis of photometry and radial velocities, we derived the following parameters for HD 2685 b: P = 4.12688_−0.00004^+0.00005 days, e = 0.091_−0.047^+0.039, M_P = 1.17 ± 0.12 M_J, and R_P =1.44 ± 0.05 R_J. This system is a typical example of an inflated transiting hot Jupiter in a low-eccentricity orbit. Based on the apparent visual magnitude (V = 9.6 mag) of the host star, this is one of the brightest known stars hosting a transiting hot Jupiter, and it is a good example of the upcoming systems that will be detected by TESS during the two-year primary mission. This is also an excellent target for future ground- and space-based atmospheric characterization as well as a good candidate for measuring the projected spin-orbit misalignment angle through the Rossiter–McLaughlin effect.